.FASTA File Extension

FASTA Sequence File

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What is a FASTA file?

A FASTA file contains a record of nucleic acid sequences (such as DNA sequences) or protein sequences saved in the text-based FASTA format. Each FASTA file can contain multiple sequences, which is why FASTA is sometimes referred to as the FASTA database format. FASTA files can be viewed and analyzed using DNA analysis software.

More Information

FASTA files often start with a header line that may contain comments or other information. The rest of the file contains sequence data. Each sequence starts with a ">" symbol followed by the name of the sequence. The rest of the line describes the sequence and the remaining lines contain the sequence itself.

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Programs that open FASTA files

Updated March 22, 2022

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